capers

data {
  int<lower=0> n_cust;
  vector<lower=0>[n_cust] x;
  vector<lower=0>[n_cust] time_of_last_txn;
  vector<lower=0>[n_cust] observation_time;
}
transformed data {
  vector<lower=0>[n_cust] x_one;
  x_one <- x + 1;
}